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Met Lab

Hiskey joined the Chicago Met Lab in September of 1943. A May 1944 New York KGB to Moscow Venona project decryption of Soviet intelligence traffic reported that Bernard Schuster of the CPUSA secret apparatus, which had been working with Soviet intelligence, had been to Chicago on the KGB's instructions. The message recorded Schuster's description of those he had come in contact with, which included Rose Olsen, and stated Olsen had been meeting with Hiskey on the instructions of the organization. In July it appears Joseph Katz had been assigned to the Hiskey case.

On 28 April 1944, Army counter-intelligence (G-2) observed Clarence Hiskey meet with Soviet Military Intelligence (GRU) Illegal Officer Arthur Adams. The government then neutralized Hiskey from the Manhattan Project by drafting him into the Army, and stationing him in Alaska for the duration of the conflict. While en route counterintelligence officers secretly searched Hiskey's luggage and found seven pages of classified notes taken from the Chicago Metallurgical Lab. When the officers subsequently performed a follow up search, the notes were no longer with Hiskey.

Investigations

In 1948, the House Un-American Activities Committee (HUAC) established that Hiskey was an active member of the CPUSA and attempted to recruit other scientists to pass secret atomic data to Soviet intelligence. Congressional investigators concluded,

"It became obvious that Hiskey had for some time been supplying Adams with secret information regarding atomic research. Immediately after seeing Adams, Hiskey flew to Cleveland, Ohio, where he contacted John Hitchcock Chapin. Chapin, through the urging of Clarence Hiskey, agreed to take over Hiskey's contacts with Adams."

Chapin admitted to investigators that Hiskey had told him that Adams was indeed a Soviet agent. Edward Manning was another Chicago Met Lab employee Hiskey attempted to recruit.

In testimony before HUAC and Senate Internal Security Subcommittee, Hiskey repeatedly refused to answer questions about his Communist associations and espionage, and in 1950 he was cited for contempt of Congress. Hiskey resigned his position as asscociate professor of analytical chemistry on the faculty of Brooklyn Polytechnic Institute and joined the International Biotechnical Corporation, later becoming director of analytical research for Endo Laboratories.

McCarthy

In june of 1953 Hiskey was subpoened to testify before the Senate Subcommittee on Investigations. In a closed door session Hiskey came face to face with Sen. Joseph McCarthy.

Sen. McCarthy: "That is about as definite proof as we can get here that you were an espionage agent, because if you were not, you would simply say no. That would not incriminate you. The only time it would incriminate you would be if you were an espionage agent. So when you refuse to answer on the ground it would incriminate you, that is telling us you were an agent.

Mr. Hiskey: "I don't think you understand the whole purpose of the Fifth Amendment, Senator. That amendment was put into the Constitution to protect the innocent man from just this kind of star chamber proceeding you are carrying on.

The proceeding closed with,

Ray Cohn: "There is one other question. Can you tell us any names of any Communists working on the Manhattan project?

Mr. Hiskey: "I refuse to answer that question.

Sen. McCarthy: "On the grounds of self-incrimination.

Mr. Hiskey: "On the grounds it may tend to incriminate me.

The subcommittee did not call Hiskey to testify in public.

The Recommendations on 27 May 1954 of the Personnel Security Board of the U.S. Atomic Energy Commission investigation into J. Robert Oppenheimer, Director of the Manhattan Project at Los Alamos, stated Oppenheimer had been found in the company of "Joseph W. Weinberg and Clarence Hiskey, who were alleged to be members of the Communist Party and to have engaged in espionage on behalf of the Soviet Union." These Findings and Recommendations ultimately lead to revokation of Oppenheimer's security clearance the following month.

With the collapse of the Soviet Union, KGB Archives were made accessible to historian Allen Weinstein and a former KGB officer Alexander Vassiliev. The identification of Hiskey as a Soviet agent cover named RAMSAY which occurs in the Venona papers, corroborated Hiskey's covert relationship with Soviet intelligence.

References

US House of Representatives, 80st Congress, Special Session, Committee on Un-American Activities, Report on Soviet Espionage Activities in Connection with the Atom Bomb, September 28, 1948 (US Gov. Printing Office).

Testimony of James Sterling Murray and Edward Tiers Manning, 14 August and 5 October 1949, U.S. Congress, House of Representatives, Committee on Un-American Activities, 81st Cong., 1st sess., 877–899.

Interlocking Subversion in Government Departments, Report of the Subcommittee to Investigate the Administration of the Internal Security Act and Other Internal Security Laws to the Committee of the Judiciary, United States Senate, 83rd Congress, 1st Session, July 30, 1953.